William and Kate's cutest moments this year

William and Kate sure were busy in 2018, being the Duke and Duchess of Cambridge.

The couple welcomed their third child, Prince Louis, and visited many charities and military bases.

Throughout the year, William and Kate were photographed laughing, playing sports, and even engaging in some royal PDA.

The world was gripped when William and Kate got married in 2011, and since then, all eyes have remained on the Duke and Duchess of Cambridge. With Prince William second in line for the English throne, he and his family are some of the most closely watched royals — and this year, William and Kate shared some heartwarming moments.

The couple usually refrains from engaging in public displays of affection, most likely due to a precedent established by Queen Elizabeth.

As INSIDER previously reported, "Since Queen Elizabeth II is rarely affectionate with Prince Philip in public, the monarch seems to have set 'an unwritten precedent' that discourages PDA — especially during official royal engagements."

They cozied up in Oslo, Norway, too.

This cute, smiley shot was captured on the couple's visit to Ovresetertjern kindergarten in Oslo, Norway, in early February.

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Kate lent her husband an encouraging hand before he played basketball in a wheelchair.

William and Kate at Copper Box Arena.
CHRIS JACKSON/AFP/Getty Images

William and Kate met basketball players using wheelchairs, 2022 Commonwealth Games hopefuls, at their visit to the Copper Box Arena in London this March. According to the Express, William's team beat Kate's in a quiz before the game, further igniting the couple's ongoing, friendly competition.

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The royal couple also played a game of boccia and, of course, teased each other along the way.

Here's William catching one of the fake snowballs thrown at him. Kate, however, managed to get away unscathed.

William and Kate walking through the fake snow.
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William joined the fight by throwing the ball he caught back toward the crowd.

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They also engaged in some witty banter at the Global Ministerial Mental Health Summit this October.

William and Kate chatting.
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While there they took a seat on the Friendship Bench. According to their official Instagram, the Friendship Bench "is used by specially trained community grandmothers in Zimbabwe as a place to listen to and support people with mental health conditions."

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The two shared a glance at Wimbledon this July.

The Duke and Duchess of Cambridge at Wimbledon.
Clive Brunskill/Getty Images

William and Kate sat with British Prime Minister Theresa May and her husband, Philip May, on day 13 of Wimbledon this July. As Kate walked past the Mays to get to her seat, photographer Clive Brunskill captured this brief albeit flirtatious glance between her and William, and our hearts melted.

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They shared a smile on the balcony of Buckingham Palace while celebrating the Royal Air Force.